- substr: documentation ( source)
- var_dump: documentation ( source)
- strpos: documentation ( source)
- end: documentation ( source)
- explode: documentation ( source)
<?php
$arr = explode('/', 'auth/signin.json');
$tail = end($arr);
$dot = strpos($tail, '.');
var_dump($tail, $dot);
var_dump(substr($tail, 0, $dot));